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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
EARNINGS PER SHARE [Abstract] |  |  |  |
Net earnings attributable to Kirby | $ 74,992 | $ 63,093 | $ 137,238 | $ 119,671
Undistributed earnings allocated to restricted shares | (435) | (459) | (806) | (859)
Income available to Kirby common stockholders - basic | 74,557 | 62,634 | 136,432 | 118,812
Undistributed earnings allocated to restricted shares | 435 | 459 | 806 | 859
Undistributed earnings reallocated to restricted shares | (434) | (457) | (803) | (856)
Income available to Kirby common stockholders - diluted | $ 74,558 | $ 62,636 | $ 136,435 | $ 118,815
Weighted average common stock issued and outstanding (in shares) | 57,010,000 | 56,752,000 | 56,957,000 | 56,712,000
Weighted average unvested restricted stock (in shares) | (331,000) | (413,000) | (334,000) | (407,000)
Weighted average common stock outstanding - basic (in shares) | 56,679,000 | 56,339,000 | 56,623,000 | 56,305,000
Dilutive effect of stock options (in shares) | 190,000 | 190,000 | 203,000 | 188,000
Weighted average common stock outstanding - diluted (in shares) | 56,869,000 | 56,529,000 | 56,826,000 | 56,493,000
Net earnings per share attributable to Kirby common stockholders: |  |  |  |
Basic (in dollars per share) | $ 1.32 | $ 1.11 | $ 2.41 | $ 2.11
Diluted (in dollars per share) | $ 1.31 | $ 1.11 | $ 2.40 | $ 2.10
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) |  |  | 117,000 | 165,000

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